Machine for compacting granular mass material



C. JACKSON June 30, 1953 MACHINE FOR COMPACTING GRANULAR MASS MATERIAL Filed Nov. 3, 1947 INVENTOR. Con a?! 'cfackda/z BY 22w 5m;

ATTORNEY:

preferably by means of flexible cables 24 which serve as vibration absorbers, these cables being connected to the eyes 25 on the ends of the front upright or pedestal 13 so that the machine may be guided by a pull on one or the other of the cables. If desired the cables may be used optionally for propulsion of the machine.

In the embodiment of the invention shown in Fig. 6 the angle shoe bars 18 are arranged to face downwardly and are welded to the base bars at [9, the edges of the adjacent shoe bars being welded at 20. The embodiment shown in Fig. 4 is preferred as the shoe bars may be effectively welded to the base bars, and it is not necessary to weld the edges as is desirable in the embodiment shown in Fig. 6.

The arrangement shown in Fig. '7 is the same as that shown in Fig. 6 with the exception that the shoe bars 2| are of curved section and they are welded to the base bars at 22, adjacent shoe bars being welded at their meeting edges 23. It will be noted that the bars are arranged so that the face of the shoe consists of a continuous series of parallel channels. The walls of the channels greatly increase the area of the shoe in contact with the material compacted. The engagement of the shoe with the material compacted tends to keep it in a straight path as it is advanced as the result of its own vibration.

The machine may be operated close to a wall or the like. The machine of this invention is especially desirable for use in compacting granular materials such as sand, cinders and gravel, and results in a compaction such that detrimental settlement does not occur under load, and relatively steep slopes may be employed without danger of slides.

Compaction by the use of the machine of this invention results in a certain amount of rearrangement and interlocking of the particles which cannot be accomplished by heavy loads or pressure compaction or pounding. Where a crushed mass is treated the tendency of the pieces to arch is largely overcome. I have used the term high frequency and have obtained satisfactory results at a frequency range of 2500 to 5000. It is desirable to vary the frequency with the material treated, but a frequency of 3500 to 4000 is satisfactory for most materials.

It is ordinarily desirable to take at least two passes of the machine over the material to be compacted, this insuring that the whole mass be subjected to the vibrations. In deep fills the machine is desirably used on successive layers of ten to fifteen inches in depth.

The machine illustrated is highly desirable for the practice of the invention.

Having thus described the invention what is claimed as new and desired to secure by Letters Patent:

1. In a machine of the class described, the combination of a vibratory shoe comprising base bars, a plurality of shoe bars of angle section welded in edge to edge relation on the under sides of said base bars with their angles facing upwardly, said shoe bars coacting to provide a plurality of downwardly facing channels open from front to rear of the shoe and having downwardly diverging walls, the arms of the shoe bars being converged towards each other at their i front ends providing nose portions having side walls diverging from each other from the front ends of the nose portions rearwardly and providing forwardly expanding throats for the channels, a forwardly inclined nose plate secured at its lower edge to the upper edges of the shoe bars at their front ends, uprights mounted on said base bars, said base bars being disposed adjacent the front and rear ends of said shoe bars, means for vibrating said vibratory shoe at high frequency comprising an electric motor having a rotor provided with an unbalancing weight centrally mounted on said uprights in substantially spaced relation from the shoe bars and with the axis of the rotor disposed substantially parallel to said shoe bars and channels and with its unbalancing weight located forward a line disposed transversely of the shoe and centrally between the front and rear ends thereof, said shoe bars sloping upwardly at the forward ends thereof between said channels to facilitate forward movement of the shoe as the shoe is vibrated, said shoe bars terminating abruptly at the rear thereof for digging into the compacted material to prevent rearward movement of the shoe as the same is vibrated, said channels open from the front to the rear of the shoe facilitating forward travel of the shoe in a straight line as the shoe is vibrated, and flexible vibration absorbing cables connected in laterally spaced relation at the front of the machine for guiding and optionally for propulsion of the machine.

2. In a machine of the class described, the

. combination of a vibratory shoe comprising base bars, a plurality of shoe bars of angle section welded in edge to edge relation on the under sides of said base bars with their angles facing upwardly, said shoe bars coacting to provide a plurality of downwardly facing channels open from front to rear of the shoe and having downwardly diverging walls, uprights mounted on said base bars, said base bars being disposed adjacent the front and rear ends of said shoe bars, means for vibrating said vibratory shoe at high frequency comprising an electric motor having a rotor provided with an unbalancing weight centrally mounted on said uprights in substantially spaced relation from the shoe bars and with the axis of the rotor disposed substantially parallel to said shoe bars and channels and with its unbalancing weight located forward a line disposed transversely of the shoe and centrally between the front and rear ends thereof, said shoe bars sloping upwardly at the forward ends thereof between said channels to facilitate forward movement of the shoe as the shoe is vibrated, said shoe bars terminating abruptly at the rear thereof for digging into the compacted material to prevent rearward movement of the shoe as the same is vibrated, said channels open from the front to the rear of the shoe facilitating forward travel of the shoe in a straight line as the shoe is vibrated, and flexible vibration absorbing cables connected in laterally spaced relation at the front of the machine for guiding and optionally for propulsion of the machine.

3. In a machine of the class described, the combination of a vibratory shoe comprising base bars, a plurality of shoe bars of angle section fixedly mounted in edge to edge relation on the under sides of said base bars and coacting to provide a plurality of downwardly facing channels open from front to rear of the shoe, means for vibrating said vibratory shoe at high frequency carried by said base bars and comprising a rotor provided with an unbalancing weight centrally disposed between the opposite sides of the shoe and with the axis of the rotor disposed substantially parallel to said shoe bars and channels and with the unbalancing weight located substantially nearer to the forward end of the shoe than to the rear end thereof, said shoe sloping upwardly at the forward end thereof between the channels thereof, said channels open from the front to the rear of the shoe engaging the compacted material facilitating forward travel of the shoe in a straight line as the shoe is vibrated, and vibration absorbing means connected in spaced relation at the front of the machines for guiding and optionally for propulsion of the machine.

4. In a machine of the class described, the combination of a shoe provided with a plurality of downwardly facing channels having down- Wardly diverging side walls and open from the front to rear of the shoe, and means for vibrating the shoe at a high frequency comprising a rotor having an unbalancing weight, the axis of said motor being disposed parallel to said channels, and means for supporting the rotor and unbalancing weight on the shoe in substantially vertically spaced relation from the shoe, said unbalancing weight being disposed closer to the of downwardly facing channels open from front to rear of the shoe, and means for vibrating the shoe at a high frequency comprising a rotor having an unbalancing weight, the axis of said motor being disposed parallel to said channels, and means for supporting the rotor and unbal ancing weight on the shoe in substantially vertically spaced relation from the shoe, said unbalancing weight being disposed closer to the forward end of the shoe than to the rear end thereof, said shoe at the forward ends of the channels thereof sloping upwardly to facilitate forward travel of the shoe as the shoe is vibrated, said channels open from the front to the rear of the shoe engaging the compacted material facilitating travel of the shoe forward in a straight line as the shoe is vibrated.

CORWILL JACKSON,

References Cited in the file of this patent UNITED STATES PATENTS 

